Seen here are some examples of Closed Rise, Open Rise, Closed String, Concealed String and Cut String stair designs.
Standard stairs with tread & rise housed into the stair string on either side. Needs soffit lining or cupboard underneath after installation.
No rise between the treads, so you can see through them. Lets light through the stair – a great idea for small spaces, or for when stairs go over another staircase.
Closed string stair is where you can see a beam on the side of the stair closing off tread & rise profile. Also generally where the balustrade is attached.
Generally, where the tread & rise goes between two walls. No stringer visible when walking up the stair. Can also incorporate a shadow line nosing at the tread & rise junction.
Where you see the profile of the tread & rise from the side and the string is cut to go under the tread & rise, thus giving a saw tooth effect.